你会想到一群色彩斑斓的野生动物：鹦鹉的彩虹羽毛或海鱼的艳丽鳞片。
A group of colorful wild animals will spring to mind: a parrot's rainbow feathers or the showy scales of sea fish.
你在哺乳动物身上找不到羽毛，在灵长类动物身上找不到腮。
You won't ever find feathers on a mammal or gills on a primate.
直到最近在分类学上，鸟的定义是一只有羽毛的动物。
Taxonomically, the very definition of a bird was until recently an animal that has feathers.
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